Tree Set:
=========

Set Interface  ==> Sorted Set Interface ==> Navigable interface ==> Tree Set Class

-> Tree Set Class which implements from Navigable Interface which extends from Sorted Set Interface which extends from Set Interface 
-> TreeSet class same as "TreeMap".
-> At the time of TreeSet object creation, the JVM can reserve the internal capacity as 16 for TreeSet and with load factor of '0.75'.

Methods:
=======
1) first()
2) last()
3) subset(E from, E to)
4) splitrerator()
5) tailSet(E from)
===========
	==> return a set, whose elements are greater or equal fromElement
6) headset(E from)
==================	
	==> return a set, whose elements are lesser or equal to fromElement.

set = {9,7,6,1,3,5}
Sorted Set ==> {1,3,5,6,7,9}
tailSet(7) ==> {7,9}
headset(7) ==> {1,3,5,6,7}

Methods of Navigable Interface:
===============================
1) higher(element)
==================
	==> returns the least which should be strictly greater than the given element.
2) lower(element)
=================
	==> returns the highest which should be strictly lesser than the element element.
3) ceiling(element)
===================
	==> returns the element which should be greater than or equal.
4) floor(element)
=================
	==> return the element which should be lesser than or equal.
5) pollFirst()
==============
	==> return and remove the first element from the set.
6) pollLast()
=============
	==> return and remove the last element from the set.

s = {1,11,7,3,5,13,10}
higher(5) ==> {1,3,4} ==> 4
lower(5) ==> {5,7,10,11,13} ==> 5
ceiling(5) ==> 13

package pack.p1;

import java.util.TreeSet;

class Book implements Comparable<Book>{
	private String isbn;
	private String title;
	private String author;
	private int publicationYear;
	public Book(String isbn, String title, String author, int publicationYear) {
		super();
		this.isbn = isbn;
		this.title = title;
		this.author = author;
		this.publicationYear = publicationYear;
	}
	public String getIsbn() {
		return isbn;
	}
	public String getTitle() {
		return title;
	}
	public String getAuthor() {
		return author;
	}
	public int getPublicationYear() {
		return publicationYear;
	}
	@Override
	public int compareTo(Book o) {
		return this.title.compareTo(o.title);
	}
	@Override
	public String toString() {
		return "Book [isbn=" + isbn + "]";
	}
}

class LibraryCatalog{
	
	TreeSet<Book> catalog = new TreeSet<>();
	public void addBook(Book book) {
		catalog.add(book);
	}
	public void removeBook(Book book) {
		catalog.remove(book);
	}
	
	public Book searchByTitle(String title) {
		for(Book b:catalog) {
			if(b.getTitle().equalsIgnoreCase(title)) {
				return b;
			}
		}
		return null;
	}
	
	public void display() {
		for(Book b:catalog) {
			System.out.println(b);
		}
	}

}

public class DigitalLibrarySystem {
	
	public static void main(String[] args) {
		LibraryCatalog library = new LibraryCatalog();
		
		library.addBook(new Book("123-ABC","Java Programming","John",2019));
		library.addBook(new Book("ABC-321","Python Programming","Karthik",2020));
		library.addBook(new Book("321-PQR","java programming fundamentals","Josef",2021));
		library.addBook(new Book("PQR-123","python programming fundamentals","Mitchel",2023));
		library.addBook(new Book("XYZ-123","Advanced Java Programming","LNRAO",2024));
		library.addBook(new Book("123-XYZ","Advanced Python","Ashok IT",2023));
		
		library.display();
		
		Book f = library.searchByTitle("Advanced Java Programming");
		System.out.println(f);
	}

}